Stock Based Compensation Performance-based Restricted Stock Textual (Details) (USD $)
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3 Months Ended |
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Mar. 31, 2015
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Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | 21,780 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 40.03 |